Akanksha-kedia opened a new pull request, #17069:
URL: https://github.com/apache/pinot/pull/17069
### Benefits of using BooleanSupplier
The `RealtimeTableDataManager` class uses Java's `BooleanSupplier`
functional interface extensively for lazy evaluation of boolean conditions.
This approach provides several advantages:
1. __Lazy Evaluation__: The boolean condition is only evaluated when needed,
which is more efficient when the evaluation is expensive or rarely needed.
2. __Stateful Evaluation__: As seen in the implementation of
`_isTableReadyToConsumeData`, a `BooleanSupplier` can maintain internal state
between invocations:
```java
_isTableReadyToConsumeData = new BooleanSupplier() {
volatile boolean _allSegmentsLoaded;
long _lastCheckTimeMs;
@Override
public boolean getAsBoolean() {
// Logic with internal state management
}
};
```
3. __Thread Safety__: The implementation includes proper synchronization
with `synchronized` blocks and `volatile` variables to ensure thread safety.
4. __Simplified Conditional Logic__: For simpler cases, lambda expressions
provide concise implementations:
```java
_isTableReadyToConsumeData = () -> true;
```
5. __Consistent API__: Using a standard functional interface from
`java.util.function` package provides a clear contract with the
`getAsBoolean()` method.
### Implementation in RealtimeTableDataManager
The class uses `BooleanSupplier` in several key places:
1. As a constructor parameter and instance variable to determine if the
server is ready to serve queries:
```java
private final BooleanSupplier _isServerReadyToServeQueries;
```
2. For determining if a table is ready to consume data:
```java
private BooleanSupplier _isTableReadyToConsumeData;
```
3. As a parameter to the `createRealtimeSegmentDataManager` method:
```java
protected RealtimeSegmentDataManager createRealtimeSegmentDataManager(
// other parameters
BooleanSupplier isTableReadyToConsumeData)
```
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